1. Tides are a periodic rise and fall of water in the ocean. A low tide of 4.2 meters in White Rock, B.C. occurs at \( 4: 30 \) a.m., and the next high tide of 11.8 meters occurs at \( 11: 30 \) a.m. the same day. a. Write a sinusoidal function that describes the tide flow. b. What is the height at 1:15 p.m. that same day?

sis \( \sin \left(\frac{\pi}{2}+t\right) \)

а) Решите неравенство: \( \sin y<-\frac{1}{\sqrt{2}} \)

4. O kacie \( \alpha \) wiadomo, ze jest to kąt ostry itg \( \alpha=\frac{5}{3} \). Oblicz \( \sin \alpha \) i \( \cos \alpha \).

¿En qué cuadrante se encuentra \( 265^{\circ} \) ? \( \begin{array}{ll}\text { (A) } Q_{1} & \text { (B) } Q_{2} \\ \text { (C) } Q_{3} & \text { (D) } Q_{4} \\ \text { Convierte } 72^{\circ} 13^{\prime} 59^{\prime \prime} \text { a grados. } \\ \begin{array}{ll}\text { (A) } 72.2331^{\circ} & \text { (B) } 72.1359^{\circ} \\ \text { (C) } 72.3762^{\circ} & \text { (D) } 72.4179^{\circ}\end{array}\end{array} \$ \begin{array}{l}\end{array} \)

\( \frac{1}{1-\sin (\alpha )}+\frac{1}{1+\sin (\alpha )}-2\tan (^{2}\alpha )^{} \)